3Des加解密 C#--->Java

Java的Byte范围为-128至127，c#的Byte范围是0-255.
核心是确定Mode和Padding，关于这两个的意思可以搜索3DES算法相关文章。

1. C#采用CBC Mode，PKCS7 Padding,Java采用CBC Mode，PKCS5Padding Padding
2. C#采用ECB Mode，PKCS7 Padding,Java采用ECB Mode，PKCS5Padding Padding
   其中Java的ECB模式不需要IV 对字符加密时，双方采用的都是UTF-8编码

C#

/// <summary>
/// DES3加密解密
/// </summary>
public class Des3
{
    #region CBC模式**
    /// <summary>
    /// DES3 CBC模式加密
    /// </summary>
    /// <param name="key">密钥</param>
    /// <param name="iv">IV</param>
    /// <param name="data">明文的byte数组</param>
    /// <returns>密文的byte数组</returns>
    public static byte[] Des3EncodeCBC( byte[] key, byte[] iv, byte[] data )
    {
        //复制于MSDN
        try
        {
            // Create a MemoryStream.
            MemoryStream mStream = new MemoryStream();
            TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
            tdsp.Mode = CipherMode.CBC;             //默认值
            tdsp.Padding = PaddingMode.PKCS7;       //默认值
            // Create a CryptoStream using the MemoryStream
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream( mStream,
                tdsp.CreateEncryptor( key, iv ),
                CryptoStreamMode.Write );
            // Write the byte array to the crypto stream and flush it.
            cStream.Write( data, 0, data.Length );
            cStream.FlushFinalBlock();
            // Get an array of bytes from the
            // MemoryStream that holds the
            // encrypted data.
            byte[] ret = mStream.ToArray();
            // Close the streams.
            cStream.Close();
            mStream.Close();
            // Return the encrypted buffer.
            return ret;
        }
        catch ( CryptographicException e )
        {
            Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
            return null;
        }
    }
    /// <summary>
    /// DES3 CBC模式解密
    /// </summary>
    /// <param name="key">密钥</param>
    /// <param name="iv">IV</param>
    /// <param name="data">密文的byte数组</param>
    /// <returns>明文的byte数组</returns>
    public static byte[] Des3DecodeCBC( byte[] key, byte[] iv, byte[] data )
    {
        try
        {
            // Create a new MemoryStream using the passed
            // array of encrypted data.
            MemoryStream msDecrypt = new MemoryStream( data );
            TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
            tdsp.Mode = CipherMode.CBC;
            tdsp.Padding = PaddingMode.PKCS7;
            // Create a CryptoStream using the MemoryStream
            // and the passed key and initialization vector (IV).
            CryptoStream csDecrypt = new CryptoStream( msDecrypt,
                tdsp.CreateDecryptor( key, iv ),
                CryptoStreamMode.Read );
            // Create buffer to hold the decrypted data.
            byte[] fromEncrypt = new byte[data.Length];
            // Read the decrypted data out of the crypto stream
            // and place it into the temporary buffer.
            csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length );
            //Convert the buffer into a string and return it.
            return fromEncrypt;
        }
        catch ( CryptographicException e )
        {
            Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
            return null;
        }
    }
    #endregion  

    #region ECB模式
    /// <summary>
    /// DES3 ECB模式加密
    /// </summary>
    /// <param name="key">密钥</param>
    /// <param name="iv">IV(当模式为ECB时，IV无用)</param>
    /// <param name="str">明文的byte数组</param>
    /// <returns>密文的byte数组</returns>
    public static byte[] Des3EncodeECB( byte[] key, byte[] iv, byte[] data )
    {
        try
        {
            // Create a MemoryStream.
            MemoryStream mStream = new MemoryStream();
            TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
            tdsp.Mode = CipherMode.ECB;
            tdsp.Padding = PaddingMode.PKCS7;
            // Create a CryptoStream using the MemoryStream
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream( mStream,
                tdsp.CreateEncryptor( key, iv ),
                CryptoStreamMode.Write );
            // Write the byte array to the crypto stream and flush it.
            cStream.Write( data, 0, data.Length );
            cStream.FlushFinalBlock();
            // Get an array of bytes from the
            // MemoryStream that holds the
            // encrypted data.
            byte[] ret = mStream.ToArray();
            // Close the streams.
            cStream.Close();
            mStream.Close();
            // Return the encrypted buffer.
            return ret;
        }
        catch ( CryptographicException e )
        {
            Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
            return null;
        }
    }
    /// <summary>
    /// DES3 ECB模式解密
    /// </summary>
    /// <param name="key">密钥</param>
    /// <param name="iv">IV(当模式为ECB时，IV无用)</param>
    /// <param name="str">密文的byte数组</param>
    /// <returns>明文的byte数组</returns>
    public static byte[] Des3DecodeECB( byte[] key, byte[] iv, byte[] data )
    {
        try
        {
            // Create a new MemoryStream using the passed
            // array of encrypted data.
            MemoryStream msDecrypt = new MemoryStream( data );
            TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
            tdsp.Mode = CipherMode.ECB;
            tdsp.Padding = PaddingMode.PKCS7;
            // Create a CryptoStream using the MemoryStream
            // and the passed key and initialization vector (IV).
            CryptoStream csDecrypt = new CryptoStream( msDecrypt,
                tdsp.CreateDecryptor( key, iv ),
                CryptoStreamMode.Read );
            // Create buffer to hold the decrypted data.
            byte[] fromEncrypt = new byte[data.Length];
            // Read the decrypted data out of the crypto stream
            // and place it into the temporary buffer.
            csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length );
            //Convert the buffer into a string and return it.
            return fromEncrypt;
        }
        catch ( CryptographicException e )
        {
            Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
            return null;
        }
    }
    #endregion  

    /// <summary>
    /// 类测试
    /// </summary>
    public static void Test()
    {
        System.Text.Encoding utf8 = System.Text.Encoding.UTF8;
        //key为abcdefghijklmnopqrstuvwx的Base64编码
        byte[] key = Convert.FromBase64String( "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4" );
        byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };      //当模式为ECB时，IV无用
        byte[] data = utf8.GetBytes( "中国ABCabc123" );
        System.Console.WriteLine( "ECB模式:" );
        byte[] str1 = Des3.Des3EncodeECB( key, iv, data );
        byte[] str2 = Des3.Des3DecodeECB( key, iv, str1 );
        System.Console.WriteLine( Convert.ToBase64String( str1 ) );
        System.Console.WriteLine( System.Text.Encoding.UTF8.GetString( str2 ) );
        System.Console.WriteLine();
        System.Console.WriteLine( "CBC模式:" );
        byte[] str3 = Des3.Des3EncodeCBC( key, iv, data );
        byte[] str4 = Des3.Des3DecodeCBC( key, iv, str3 );
        System.Console.WriteLine( Convert.ToBase64String( str3 ) );
        System.Console.WriteLine( utf8.GetString( str4 ) );
        System.Console.WriteLine();
    }
}

java

import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class Des3 {
    public static void main(String[] args) throws Exception {
        byte[] key=new BASE64Decoder().decodeBuffer("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4");
        byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };
        byte[] data="中国ABCabc123".getBytes("UTF-8");  

        System.out.println("ECB加密解密");
        byte[] str3 = des3EncodeECB(key,data );
        byte[] str4 = ees3DecodeECB(key, str3);
        System.out.println(new BASE64Encoder().encode(str3));
        System.out.println(new String(str4, "UTF-8"));
        System.out.println();
        System.out.println("CBC加密解密");
        byte[] str5 = des3EncodeCBC(key, keyiv, data);
        byte[] str6 = des3DecodeCBC(key, keyiv, str5);
        System.out.println(new BASE64Encoder().encode(str5));
        System.out.println(new String(str6, "UTF-8"));
    }
    /**
     * ECB加密,不要IV
     * @param key 密钥
     * @param data 明文
     * @return Base64编码的密文
     * @throws Exception
     */
    public static byte[] des3EncodeECB(byte[] key, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, deskey);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
    /**
     * ECB解密,不要IV
     * @param key 密钥
     * @param data Base64编码的密文
     * @return 明文
     * @throws Exception
     */
    public static byte[] ees3DecodeECB(byte[] key, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, deskey);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
    /**
     * CBC加密
     * @param key 密钥
     * @param keyiv IV
     * @param data 明文
     * @return Base64编码的密文
     * @throws Exception
     */
    public static byte[] des3EncodeCBC(byte[] key, byte[] keyiv, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(keyiv);
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
    /**
     * CBC解密
     * @param key 密钥
     * @param keyiv IV
     * @param data Base64编码的密文
     * @return 明文
     * @throws Exception
     */
    public static byte[] des3DecodeCBC(byte[] key, byte[] keyiv, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(keyiv);
        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
}